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I can't believe it was almost 10 years ago since I first heard about the RepRap project. It is an open source hardware project aims at building a self-replicating 3D printer. The concept of open source mechanical hardware was new at the time. I badly wanted to have one but I could not afford it. The kit was so expensive at the time. If I remember it right, the kit was being sold for 4,000 USD. It was way beyond my ability to afford. It's the price of a second hand car. After all, I was making only a few thousands pesos (Php) at the time.

Two weeks ago, while I was checking for the status of my online purchases at AliExpress, an advertisement came up about a 3D printer called Delta. It caught my attention so I clicked the ad which leads me to a product on sale about a something called Kossel Delta 3D printer. It looks familiar, it looks like a RepRap design but it's different. There is no Cartesian rods, instead, it has a triangular frame wherein three stepper motors are dr…

I am currently in the process of learning Hadoop architecture,
administration and the MapReduce programming model. I started reading about
Hadoop and took free online courses but there is something missing. I wanted to
try out what I read or what I was told on those training. In some exercises in
the training a VM was used as a single node Hadoop server. But for me it
doesn’t make sense, so I tried out setting up more VM and configured them into
a Hadoop cluster. But still the experience was not very satisfying because it
lacks the touch of the hardware. I wasn’t really running a cluster but simply
just a bunch of virtual machines connected together in a virtual network. So I
thought “How about I build a cluster of cheap computers.” In fact, that’s what Hadoop
was designed for, to run on a cluster of commodity hardware. I tried googling
around about cheap cluster computer and found a few blogs and videos about guys
who ran MPI and Hadoop on a mini cluster of Raspberry Pi boards. So I …